When solving an equation with two variables, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)
If a = -9 and x = -4, what is the value of 9a(a - x)?
| -14 | |
| 378 | |
| 405 | |
| 90 |